Question: PLANE GEOMETRY (Do NOT answer the same set of questions. There are other sets of questions I posted. Answer those. Please.) - Analyze and solve

PLANE GEOMETRY (Do NOT answer the same set of questions. There are other sets of questions I posted. Answer those. Please.) - Analyze and solve for unknowns in every problem given. Submit the scanned copy of your solutions. Digital solutions are highly encourage. If written solutions, use a black ballpen and white bond paper. STRICTLY NO ERRASURES ALLOWED!

TEST 1.

Problem 1. The sum of the interior angles is six times the sum of its exterior angles. How many diagonals does this polygon have?

Problem 2. Find the area of a regular decagon if one of its sides measures 4 cm.

Situation 1: Chords AB and CD intersect each other at O inside the circle. AO = 8 cm, CO = 12 cm, DO = 20 cm and AB = diameter of the circle.

Problem 3. Compute the diameter of the circle.

Problem 4. Compute the length of arc AC.

Problem 5. Determine the area of OCA.

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